By Michael Bartlett on May 18th, 2026 in PFAS/AFFF
For decades, manufacturers and regulators evaluated firefighting foam safety based on controlled laboratory testing. These tests assumed products would be safe when used according to instructions, that exposure would be minimized through compliance with guidelines. Real-world exposure research now reveals a very different picture.
A review screened 6,860 articles before narrowing the data to 76 qualifying studies involving real-world firefighter exposures. The focus is on actual exposure conditions at fire scenes, not small-scale lab tests. These findings challenge assumptions the industry has held about how firefighters are exposed to toxic chemicals through AFFF and help explain why cancer rates in the firefighter community keep rising even when safety protocols are followed.
Firefighting foam use guidelines were developed around controlled application assumptions. Industry testing of AFFF was performed under conditions where application was performed according to specific instructions, environmental variables were limited, and exposure duration was short and controlled. These lab conditions bore little resemblance to actual firefighting operations.
Under the controlled-use assumption, products are considered safe when used according to instructions, exposure is assumed to be minimized through compliance, and PPE is assumed to reduce risk. In contrast, real-world findings show that:
Real-world exposure studies show firefighters operate in environments where exposure extends beyond the point of application and cannot be fully controlled through procedural instructions alone. Wind patterns change. Fires behave unpredictably. Foam disperses over surfaces and mixes in with water run-off. Smoke carries contaminated particles throughout the area.
Lab-based safety testing centered primarily on direct contact during foam application. What real-world research reveals is that contamination moves through smoke, gear, skin contact, runoff, overhaul operations, and station contamination in ways the lab never accounted for.
Burning foam sends PFAS particles into the smoke, spreading them across the entire fire scene. Firefighters inhale those particles during suppression and overhaul operations. Gear soaked with foam residue keeps exposing firefighters through skin contact for hours or even days after the fire. PFAS are then transported far from the initial foam application zone by contaminated runoff, greatly expanding the zone of exposure.
Station contamination begins when firefighters bring contaminated gear back to the firehouse. PFAS moves from that gear onto surfaces in apparatus bays, locker rooms, and living quarters. During routine maintenance and cleaning, firefighters absorb those chemicals through skin contact with contaminated equipment.
Industry testing assumed that personal protective equipment would protect firefighters from exposure. Real-world studies show that standard firefighting PPE was never designed to protect against PFAS chemicals. Turnout gear is designed to resist heat and flames, not to create a chemical barrier against persistent organic pollutants.
PFAS chemicals are small enough to penetrate fabrics and seams. They absorb through the skin during extended operations when firefighters are hot and sweating. Gloves become saturated with foam during application. Firefighters remove helmets, adjust gear, and wipe sweat from their faces with contaminated gloves, creating direct pathways for chemical absorption.
Lab testing looked at exposure during foam application, which usually lasts just a few minutes. In real-world firefighting, overhaul operations can go on for hours after the flames are out. During overhaul, firefighters search through debris, tear into structures, and move materials to make sure no hidden fire is still burning.
These operations generate dust clouds of PFAS particles from foam residue that settled on surfaces throughout the structure. Firefighters work in these contaminated spaces without breathing apparatus because the immediate fire danger has passed. This creates prolonged inhalation exposure that lab testing never considered.
The findings support the broader argument that exposure science has historically underestimated the scope of who was exposed and when. Manufacturers and regulators assessed AFFF safety under idealized conditions that had little to do with actual firefighting operations. Firefighters did not work in clean labs. They dealt with foam mixing alongside petroleum products, building materials, and combustion byproducts on every job.
This gap between lab assumptions and real-world conditions helps explain why cancer rates among firefighters exceed those in the general population despite industry claims that AFFF was safe when used properly. The product was never tested under conditions that matched how firefighters actually encountered it.
The research showing that real-world exposure far exceeded industry lab predictions strengthens legal claims for firefighters who developed cancer. It demonstrates that manufacturers knew or should have known that their controlled-use safety data did not reflect actual exposure conditions.
If you developed cancer after using AFFF during your firefighting career, the gap between lab testing and real-world exposure supports your AFFF exposure claim. ELG Law has represented firefighters exposed to AFFF for over 35 years. Contact us for a free case evaluation to see if you qualify for compensation for your AFFF exposure and cancer diagnosis.